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a substance freezes when vapour pressure of its liquid phase equals vapour pressure of its solid phase these are lines from ncert what is the meaning of vapour pressure of solid and why does that happen.

a substance freezes when vapour pressure of its liquid phase equals vapour pressure of its solid phase
these are lines from ncert
what is the meaning of vapour pressure of solid and why does that happen.

Grade:12

2 Answers

Harishwar IIT Roorkee
askIITians Faculty 50 Points
9 years ago
orce exerted by the gas or vapor released by a liquid or solid substance in a closed container or space. Vapor pressure is a relative measure of the tendency to evaporate (volatility), depends on the nature of the substance and ambient temperature, and reaches a state of equilibrium (where no more vapors escape from the substance) in closed spaces. Often expressed as pounds per square inch (PSI), it is stated usually in millimeters of mercury (mmHg) at 68°F (20°C) in a MSDS.

rohan
12 Points
9 years ago
but how can solid can have vapour pressure e.g; ice first melts to form liquid then the liquid and vapour comes to equilibrium which exerts pressure.
how can solid directly go to vapour in case of ice

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